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[Cytogenetic analysis of the action of new bifunctional alkylating compounds]
Abstract:
The mutagenic activity of nitrogen mustard derivatives of aminovinylketones (NP-130, NP-161, NP-163), aminovinylphosphoric acid (RVS-445, RVS-446, RVS-448, RVS-398) and ethylene imine derivatives of ethane sulphonic acid (AR, RJ) was established for the first time in the experiments with Allium fistulosum L. The mutagenic activity of aminovinylketones (NP-130, NP-160) was established for the first time in the experiments with Crepis capillaris (L.) Wallr. The effect of the compounds studied on the seedlings characterized by the high level of natural mutability of chromosomes did not alter the spectrum of structural chromosome mutations. As it is shown by the results of the analysis, the compounds studied exert their action mainly at the S stage of the cell cycle. However, the initiation of potential changes at the G1 stage that are realized into actual breaks at the S stage is not excluded. In some experiments in which high concentrations of mutagens were used no delayed effect was observed which might be explained by the action of mutagens on cells at the G2 stage or at a still later stage.
Insights
This study reveals the mutagenic activity of novel nitrogen mustard and ethylene imine derivatives in plant models like Allium fistulosum and Crepis capillaris. These compounds primarily affect the S stage of the cell cycle, impacting chromosome structure.
Area of Science:
- Genetics
- Molecular Biology
- Plant Science
Background:
- Nitrogen mustard and ethylene imine derivatives are classes of chemical compounds with known biological activity.
- Understanding the mutagenic potential of novel chemical structures is crucial for safety and application.
- Plant models offer a robust system for initial genotoxicity screening.
Purpose of the Study:
- To investigate the mutagenic activity of specific nitrogen mustard derivatives (aminovinylketones, aminovinylphosphoric acid) and ethylene imine derivatives.
- To determine the stage of the cell cycle at which these compounds exert their primary mutagenic effects.
- To assess the impact of these mutagens on chromosome mutation spectra in plant seedlings.
Main Methods:
- Exposure of Allium fistulosum L. and Crepis capillaris (L.) Wallr. seedlings to various chemical compounds.
- Cytogenetic analysis to evaluate structural chromosome mutations.
- Cell cycle analysis to pinpoint the stage of action (G1, S, G2).
Main Results:
- Mutagenic activity was established for nitrogen mustard derivatives (NP-130, NP-161, NP-163, RVS-445, RVS-446, RVS-448, RVS-398) and ethylene imine derivatives (AR, RJ) in Allium fistulosum.
- Mutagenic activity of aminovinylketones (NP-130, NP-160) was confirmed in Crepis capillaris.
- The compounds primarily act during the S stage of the cell cycle, with potential initiation of damage in G1.
- High concentrations did not show delayed effects, suggesting action at G2 or later stages.
Conclusions:
- Novel nitrogen mustard and ethylene imine derivatives exhibit mutagenic properties in plant systems.
- The primary mechanism of action involves interference with DNA replication during the S phase.
- Further research is needed to fully elucidate the genotoxic mechanisms and potential delayed effects at later cell cycle stages.